Seametrics PT35 User Manual download pdf (Page 2)

Mounting. Use a secure surface that will accept screws.

Remove the front clear cover by use of the thumb screws to

access the mounting holes at the four corners. Using the box

as a template, mark the centers of the holes with a pencil and

drill. Insert screws through the four corner holes and tighten.

Connect the Meter. Because the PT35 comes standard with

a built-in meter connector, the simplest method of connect-

ing your Seametrics meter to the PT35 is to order a mating

“Seametrics connector” pre-installed on your meter or ow

sensor. If your meter does not have a Seametrics connector,

there are three alternatives: 1) Any wire ends can be con-

nected to the PT35 terminal block (see Connections diagram

at right). 2) A cable-with-connector can be factory-ordered

and eld-wired to your meter. 3) A connector can be factory-

ordered and eld-installed on your meter output cable (see

Connector Field Installation diagram below).

GENERAL INFORMATION

The PT35 digital counter-timer is designed to be used with

Seametrics (or similar) meters and ow sensors that produce a

pulse signal. It is typically used in water treatment and chemical

dosing applications, most often in cooling towers and boilers.

The PT35 serves as either a single or a dual timer, depending

on whether one or both of its independent accumulators and

timed outputs are used.

In single timer applications, one accumulator counts pulses

coming from the meter. When a pre-set number of pulses has

been reached, output power turns on for a set time, and then

the cycle repeats.

In dual timer applications (typically, one chemical feed and one

water bleed), both accumulators and timers are set to operate

independently with input from a single meter. A sequential

function can be selected to lock one timer out while the other

is operating. This prevents feed and bleed from occurring

simultaneously.

The PT35 can be used with dry contact meters (e.g. Seametrics

MJR meters), contacting-head meters with solid-state pickups

(e.g. Seametrics MJE meters), or insertion ow sensors (e.g.

Seametrics IP, TX, and EX Series).

Ground

Neutral

Hot

NO NC N G

Hot Normally Open

Hot Normally Closed

Neutral

Ground

Neutral

Hot Normally Closed

Hot Normally Open

H V G

OUTPUT 1

OUTPUT 2

3AG-10A-SB

Fuse

POWER

GND

SIGNAL

EXTERNALLY- PACED

METERING PUMP

DRY CONTACT

TYPE METER

GND

SIGNAL

+12 Vdc

PUMP+

SOLID STATE

TYPE METER

SOLID STAT E

TYPE METER

INSTALLATION and CONNECTION

Connector Field Installation

1POWER GND

2 INPUT SIGNAL

3POWER OUTPUT +12 Vdc

INPUT CONNECTOR

To Connector Pin 1

BLACK

WHITE

RED

To Connector Pin 2

To Connector Pin 3

To Connector Pin 1

To Connector Pin 2

Hall-effect or transistor switch

Dry contact

Connect the Load. Two output cords are provided for connec-

tion of 115 Vac loads. The unit can be hard-wired if necessary,

using the terminals inside.

Connect Power. A power cord is provided. Connect by plugging

in to any standard grounded outlet. (See Connections Diagram

above for conduit connection.)

115 Vac

12 Vdc

115 Vac

5” x 7” polycarbonate

1 - 9999 pulses

1 - 9999 seconds

1000 Hz

5 A resistive @ 115 Vac, or 1/4 HP

32˚ - 130˚ F (0˚ - 55˚ C)

Power

Sensor Power

Output (2)

Enclosure

Accumulator Range

Timer Range

Maximum Input Frequency

Relay Contact Rating

Temperature

SPECIFICATIONS*

PT35 Connections Diagram

Input Connections

PT35

*Specications subject to change • Please consult our website for current

data (www.seametrics.com).

1 2 3 4

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Seametrics PT35 User Manual Page 2

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